[PATCH v2 00/11] pwm: Add support for PWM Capture

On Fri, 29 Apr 2016, Boris Brezillon wrote:

Hi Lee,

On Fri, 22 Apr 2016 11:18:04 +0100
Lee Jones [off-list ref] wrote:

quoted

The first part of this set extends the current PWM API to allow external
code to request a PWM Capture.  Subsequent patches then make use of the
new API by providing a userspace offering via /sysfs.  The final part of
the set supplies PWM Capture functionality into the already existing STi
PWM driver.

Is there a reason you decided to not put this driver in IIO? IMHO, it
would be more appropriate to make your PWM device an MFD that can either
bind to the PWM or the capture driver.
And BTW, IIO already has a sysfs interface (you may have to extend the
API to support your type of capture though).

Multi-Function Device drivers can only be justified if the IP
contained does not and can not live in a single subsystem.  The IP
which controls both PWM-in and PWM-out in this device is the same.  I
can't fathom a sane reason why you would wish to separate this
functionality over multiple subsystems.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org ? Open source software for ARM SoCs
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